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Windows APT Warfare

You're reading from   Windows APT Warfare Identify and prevent Windows APT attacks effectively

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Product type Paperback
Published in Mar 2023
Publisher Packt
ISBN-13 9781804618110
Length 258 pages
Edition 1st Edition
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Author (1):
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Sheng-Hao Ma Sheng-Hao Ma
Author Profile Icon Sheng-Hao Ma
Sheng-Hao Ma
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Toc

Table of Contents (17) Chapters Close

Preface 1. Part 1 – Modern Windows Compiler
2. Chapter 1: From Source to Binaries – The Journey of a C Program FREE CHAPTER 3. Chapter 2: Process Memory – File Mapping, PE Parser, tinyLinker, and Hollowing 4. Chapter 3: Dynamic API Calling – Thread, Process, and Environment Information 5. Part 2 – Windows Process Internals
6. Chapter 4: Shellcode Technique – Exported Function Parsing 7. Chapter 5: Application Loader Design 8. Chapter 6: PE Module Relocation 9. Part 3 – Abuse System Design and Red Team Tips
10. Chapter 7: PE to Shellcode – Transforming PE Files into Shellcode 11. Chapter 8: Software Packer Design 12. Chapter 9: Digital Signature – Authenticode Verification 13. Chapter 10: Reversing User Account Control and Bypassing Tricks 14. Index 15. Other Books You May Enjoy Appendix – NTFS, Paths, and Symbols

EATs in PE

In Chapter 3, Dynamic API Calling – Thread, Process, and Environment Information, we successfully explored dynamic memory to get to the image base of the desired system module. These loaded PE modules are also loaded into dynamic memory through file mapping. Once we get the address of a DLL, then we can use the API’s GetProcAddress to get the address of the specific function it exports.

So, here a new question comes to mind: is there any difference in the binary structure between PE programs with export functions (DLL) and PE programs without export functions?

Figure 4.1 is dllToTest.c, an example of streamlined DLL module source code under the Chapter#4 folder of the GitHub project:

Figure 4.1 – Sample of simple DLL code

Figure 4.1 – Sample of simple DLL code

On line 16 of the code is a standard DLL entry function. When this DLL module is first mounted to the process, the global string variable, sz_Message, is modified to Hello Hackers!.

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